CBSE Class 12-science Answered
Solve for x : 2 tan?1
(cos x) = tan?1
(2 cosec x).
Asked by ambigamagendran256 | 04 Nov, 2023, 05:43: AM
Let us consider
![begin mathsize 14px style space 2 space tan to the power of negative 1 to the power of space end exponent left parenthesis cos x space right parenthesis space equals space tan to the power of negative 1 end exponent left parenthesis 2 space cos e c x space right parenthesis space equals space alpha end style](https://images.topperlearning.com/topper/tinymce/cache/4257839acee62d5a9b78169719b8a1e9.png)
From LHS , we get
![begin mathsize 14px style tan to the power of negative 1 end exponent left parenthesis cos x right parenthesis space equals space alpha over 2 end style](https://images.topperlearning.com/topper/tinymce/cache/6f142fe827d692e0c2c1f37f8bdf8c05.png)
![begin mathsize 14px style tan space alpha over 2 space equals space cos x end style](https://images.topperlearning.com/topper/tinymce/cache/0be026b0d11e5d9f47c13981fa935f0e.png)
-------------------
From RHS , we get
![begin mathsize 14px style tan space alpha space equals space 2 space cos e c space x end style](https://images.topperlearning.com/topper/tinymce/cache/fc2e35bcb5be4fff7055851f98f9530f.png)
Above expression is written as
![begin mathsize 14px style fraction numerator 2 space tan begin display style alpha over 2 end style over denominator 1 space minus space tan squared begin display style alpha over 2 end style end fraction space equals space fraction numerator 2 over denominator sin x end fraction space end style](https://images.topperlearning.com/topper/tinymce/cache/101f9f9673649cdd7e52eabb756d424c.png)
By substituting tan(α/2) from eqn.(1) , above expression is written as
![begin mathsize 14px style fraction numerator 2 space cos x over denominator 1 space minus space cos squared x end fraction space equals space fraction numerator 2 over denominator sin space x end fraction end style](https://images.topperlearning.com/topper/tinymce/cache/fb926225e85344e4c41e153b75524c7b.png)
![begin mathsize 14px style fraction numerator 2 space cos x over denominator sin squared x end fraction space equals space fraction numerator 2 over denominator sin space x end fraction end style](https://images.topperlearning.com/topper/tinymce/cache/72de45b05bf93a115556d1e06f693385.png)
From above , we get
or x = π/4
![begin mathsize 14px style sin space x space equals space cos space x end style](https://images.topperlearning.com/topper/tinymce/cache/1ac57e89decb3fa77a914fddb01dc1e3.png)
Answered by Thiyagarajan K | 04 Nov, 2023, 08:05: AM
Concept Videos
CBSE 12-science - Maths
Asked by chinnuambichinnuambi | 12 Jun, 2024, 19:07: PM
CBSE 12-science - Maths
Asked by eswarvajrapu | 06 Jun, 2024, 00:37: AM
CBSE 12-science - Maths
Asked by rp978841 | 04 May, 2024, 19:37: PM
CBSE 12-science - Maths
Asked by rajashekararishu | 05 Jan, 2024, 21:31: PM
CBSE 12-science - Maths
Asked by ambigamagendran256 | 04 Nov, 2023, 05:43: AM
CBSE 12-science - Maths
Asked by gopalkumarrai87 | 11 Oct, 2023, 11:02: AM
CBSE 12-science - Maths
Asked by amansharma08116 | 14 Jul, 2021, 09:37: AM
CBSE 12-science - Maths
Asked by lovemaan5500 | 04 Jan, 2020, 23:10: PM
CBSE 12-science - Maths
Asked by Topperlearning User | 22 Apr, 2014, 08:37: AM
CBSE 12-science - Maths
Asked by Topperlearning User | 21 Apr, 2016, 10:45: AM